Adjustable back for chairs, &amp;c.



No.781,152 l j PATBNTBD? JAN. 31, 1905.

H. B. osBoRNE.

ADJUSTABLBVBACK POR CHAIRS, &c.

AYPLIOATION FILED JUNE 4, 1904.

l angles.

UNITED STATES Patented January 31, 1905.

PATENT OFFICE.

HENRY BURWELL OSBOR-NE, OF DENVER, OOLORADOA ADJUSTABLE BACK FOR CHAIRS, t-

SPECIFICATION Yforming part of Letters Patent No. 781,152, dated January 31, 1905.

l Application flied June 4,1904. sera1'N0.z11,173.

T0 @ZZ whom zit may conoern:

Be it known that I, HENRY BURWELL Os- BORNE, a citizen of the United States, residing at Denver, in the county of Denver and State j of Colorado, have inventedicertain new and useful Improvements in Adjustable Backs for Chairs, &c.; and I do declare the following to ybe a full, clear, and exact description of the invention, such aswill enableothers skilled in the art to which it appertains` to make and use lthe same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciiication. p

This inventionrelatesto new and useful improvements in meansfor adjusting the backs of Chairs, lounges, beds, &c..;'and the object of the invention is to produce va simple and efcient means whereby the -angleat whichit is desired the back 'of the chair or other article of furniture to which the device is applied may be adjusted; and theinvention consists in various-details of construction and in arrangements of parts, which will be hereinafter fully describedFand then" specically defined in the appended Claims.

ing drawings, in which-- f y Iligure l* 1s a perspective vlewvrof my invention as applied to a chair. E1g'.'2 isa side I illustrate my invention inthe accompany# elevation'ofthe pivotal dog and bar supporting the same. F ig. 3' is a detail view ofthe connected ends of two of the bars which are fastened to the back. Y

Reference now being had to .the details of the drawings by letter, A designates the chair to which my adjusting apparatus is applied and provided with a back B, pivotally mounted in the usual manner, and E designates a bar also pivotallymounted` upon the stud 5D and has its forward end bent to'form a' hook E for a purpose whiclrwill behereinafter described. Said bar E has a 4shoulder e, which is adapted to engage one or the other of the projections K, rising from the barK, in order to hold the baok'of the chair at different Said bar K is fixed upon pins or screws N and N at any suitable location, preferably upon the arm or side of the chair, and

an inclinedy portion e intermediate the hook E and the'shoulder e is adapted to contact with and ride over the various projections K as the back of the chair is swung from its lowest position tov an upright or vertical position. One end of the bar K has an inclined portion E2, against which the inclined surface @"is adapted to contact and up which it rides as theback is swung toward a vertical position. `Pivotally mounted upon a pin O', projecting .from the bar E, is a cam member O, yhaving a curved slot Q formed therein adjacent to the cam edge Q'. Said cammember O is provided with an elongatedslot P, adapted to allow a'sliding movement of the cam as it turns upon its pivot, lsaid movement being limited byithe pin O. A pin I is provided which is mounted upon the bar E adjacent to 'saidI shoulder e and which is adapted to be engaged bythe slot Q, when the cam is at its lowest position, as shown in Fig. 2 of the drawings.

While I'have shown and described a single cam and mechanism for adjusting the back of the chair,`it will be understood that each side of theichair is equipped with similarly-con- -structed mechanism. v

Y In operation when it'is desired to throw the back from its farthest downward position to an upright or vertical position the inclined Y edge e of the bar E will ride over the projectionsV K, and in order to hold the back at its greatest angle, which will be that of its upright position, the shoulder e may engage the projection K which is nearest to the front of the chair, the free end of the bar engaging said projection by gravity whilethe cam-plate Owill'be held by the projection out of the path of said projection. When it is desired vto throw the back of the chair to its farthest limit rearward, the back of the chair is swung forward slightly sufcient to allow the camplate O to fall to the position shown in Fig. 2 by gravity, after which the curved edge thereof will be presented for contact with the series of projections as the back is swung rearward, thus preventing said shoulder e from engagement with the projections. In case it is desired to raise the back of the chair to increase the angle thereof the back is raised until the shouldered portion e rides over one or another of said projections. As the inclined edge e' of the bar rides up an inclination the bar will fall by gravity as the shoulder e drops over a projection, and by so doing the cam O will be raised and the back will be held at a certain angle. If desired to increase still further the angle at' which it is desired to have the back disposed, the latter may be raised, allowing the shoulder e to engage over the neXt projection, and so on, adjusting the angle of the back by the engagement of the shoulder with the several projections K. In case it is desired to return the back to its farthest downward limit when adjusted at any angle intermediate its limits, the back of the chair is merely drawn forward to allow the camplate O to fall by gravity into the position shown in Fig. 2, thereby presenting the rear curved edge of the plate for engagement with a projection which will prevent said shoulder engaging a projection. It will thus be seen that the back of the chair may be easily and conveniently returned to its rearward limit or raised to its greatest angle by the simple manipulation of the bar and cam-plate in the manner disclosed.

In order to limit the rearward throw of the back, the hook E catches over the rearmost of the projections K, which .projection is adjacent to theupper end of the incline E2. It will thus be seen that by the provision of an adjustingmeans embodying the features of my invention a simple and efcient mechanism is provided whereby the Aback of a chair may be adjusted at different angles and automatically.

IVhile I have shown and described my device as applied to a chair for adjusting the back thereof, it will be understood that the invention may be applied to lounges, beds, orV

other articles of furniture equally as well, and in the application of the device to such various articles of furniture the details of con struction may be changed, if desired, without in any way departing' from the spirit of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In combination with a chair having a back hinged thereto, a member secured to each side of the chair and provided with a series of upwardly-extending projections, a bar pivotally connected to the back and having a shoul dered portion adapted to engage said projections, a cam member having a sliding pivotal movement upon said bar, and a curved edge adapted to ride over said projections as the back of the chair is swung rearward, as set forth.

2. In combination with a chair and bach hinged thereto, a member secured to each side of the chair and provided with upwardly-extending projections, a bar pivotally connected to the back on each side of the chair, and a cam member carried by cach of said bars and provided with a sliding pivotal movement, one edge of-each cam being slotted', and a pin carried by each bar and adapted to engage said slot, as set forth.

3. In combination with a chair and back hinged thereto, a member secured to each side of the chair and provided with upunudly-extending projections, a bar pivotally connected to the back on each side of the chair, and a cam member carried by each of said bars and provided with a sliding pivotal movemen t` one edge of each cam being slotted, a pin carried by each bar and adapted to engage said slot, and means for limiting the rearward throw of the back, as set forth.

4. In combination with a chair having a back hinged thereto, a member secured to each side of the chair and provided with series el upwardly-extending projections, a bar pivotally connected to the back upon each side of the chair, each bar being provided with a shoulder adapted to engage said projections, a cam member pivotally mounted to have a slight sliding movement upon each of said bars, a, pin carried by each bar and adapted to engage a slot in the cam member, the latter having a rounded or cam edge adapted to ride over said projections as the back is swung` rearward, said cam members designed to be tilted as the back is swung toward a vertical or upright position, as set forth.

5. In combination with a chair with back hinged thereto, a member secured to each side of the chair provided with a series of projections, one end of said member having an in clincd surface, a bar pivotally connected one upon each side of the back and to the edge thereof, a forward end of each of .said bars being bent to form a hool; and each provided with a shoulder upon its lower edge, a cam member pivotally mounted upon each bar and having a curved edge adapted to ride over said projections as the back is swung rearward, and a pin carried by each bar adapted to engage a slot in said cam member, as set forth.

I n testimony whereof I` hereunto aliix my signature in presence of two witnesses.

HENRY BURlVELL OSBQRNIC.

Witnesses:

A Lvo H. SAwiNs, HARRY M. OsonNu.

IOO 

